Mdbook passes a version and the renderer/preprocessor can/should do a version check. Since it uses semantic versioning I would expect it to abide by those rules

Mdbook passes a version and the renderer/preprocessor can/should do a version check. Since it uses semantic versioning I would expect it to abide by those rules. There's some example code in their docs (fn handle_preprocessing in the no-op preprocessor) which I've actually included in a preprocessor I wrote some time ago. https://rust-lang.github.io/mdBook/for_developers/preprocessors.html#hooking-into-mdbook https://rust-lang.github.io/mdBook/for_developers/preprocess...